Site-wide Google impressions dropped 97% in 1 hour on July 4 – No manual action, pages still indexed

Hey everyone,

Need help with a weird case on my site Site Hidden By Admin. It’s a 14-week-old travel reference site – airline rules, connection times, packing lists, etc.

Problem:
On July 4 around 11:00, Google Search impressions dropped 97% in just one hour. From 350-600/hour to 10-20/hour.
Daily impressions: 13k → 6.5k → 600 → almost 0 now. Clicks: 75-80/day → 0-1.

It’s site-wide and global. US traffic 9k/day → 0. All top pages dropped the same way.

What I checked:

1. No Manual Action in GSC. No Security Issues.
2. Pages still “URL is on Google” and indexed. site: command shows pages.
3. Pages return 200, robots.txt fine, sitemap 0 errors, canonicals correct.
4. Bing/DuckDuckGo traffic is normal. Only Google organic dropped.
5. No DMCA on Lumen, no email notice.
6. No Google update on July 4. June spam update ended June 26.

My question:
If there’s no manual action and everything is technically fine, why would Google stop serving the site completely in 1 hour?

Has anyone seen this? Is this a false positive spam classifier? How do I get Google to review this?

Thanks in advance.